This appears to be:
http://bugzilla.gnome.org/show_bug.cgi?id=213072
Also, the procedure to reliably workaround this bug is:
1. put evolution in offline mode (File/Work Offline)
2. close evolution
3. open a terminal and run:
evolution --force-shutdown
find ~/.evolution/mail/local -name "*ev-summary" -exec rm -f {} \;
4. start evolution
5. wait several seconds (until the status bar at the bottom is empty)
6. close evolution (it may take a long time to close)
7. Start evolution
8. Enable online mode (File/Work Online)
If you start evolution in Online mode after removing the summary files,
then you may end up with duplicates and/or more folder mismatch errors.
If you don't do 'evolution --force-shutdown', then you may also end up
with more folder mismatch errors.
There seems to be some discussion of this getting fixed here:
http://www.go-evolution.org/Camel.Local#Mbox_bugs
--
Error while Refreshing folder: Summary and folder mismatch, even after a sync
https://launchpad.net/bugs/28403
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